While my adapter works, I too am a bit puzzled that the fit and finish is not ideal. It sticks out a bit, fan is extremely loud, and overheats like a mofo. Dealer says it's normal, so I guess it is...
One thing I noticed: If you leave an AUX cable plugged in, it will overwrite the sound source. I had a passenger that wanted to play some tunes through his phone and we used the AUX cable, which I left plugged in after he left. I lost Audio for the BMW Apps Web Radio. At first I thought the adapter crapped out, but luckily I found the issue - disconnected the cable and vola - all back to normal.
2011 BMW E82 1///M: AW, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods
1988 BMW E30 M3: Hennarot, S14, stock
2016 Porsche 981 GT4: Guards Red, LWBS, SC, full leather
1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister II + Fabspeed exhaust
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods